Posted by CenTexFarmall on October 06, 2007 at 21:12:53 from (172.164.243.200):
A short while back and with the help of DSlater and some others, I figured out that a '51 M of mine has some kind of replacement motor. It has a casting date of '59, "C-248" on the side and also the little plate that screws on the side of the block beneath the carb. Now, I did some investigating, took the plugs out and shined a bright light in there. I've got domed pistons, but not sure which ones and maybe you guys can help me figure that out.
Using a bent end scribe, I've determined that the dome is about .250 tall, also it has no gaps across the top of the dome, it's continuous. The quench side of the piston is flat. GeorgeKy had sent me a photo of some Firecraters and they're not like that. Also found some other photos by searching the archives and still no match. Judging by the photos, the domes don't seem to be as tall as the M&W turbo dome or some of the new aftermarket ones I've looked at. The dome does seem to be wider though.
The tractor has the X1B suffix, which makes it originally a 5000ft. altitude setup. Would a dealer have paid any attention to that when ordering a replacement motor? Or perhaps would it have been a replacement _block_ with someone building the rest from parts and putting in higher comp. pistons? Could all replacement motor in the later years have come with higher compression?
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